x/(x+3)-18/(x^2)-9=1
问题描述:
x/(x+3)-18/(x^2)-9=1
打错了是x/(x+3)-18/(x^2-9)=1
答
x/(x+3)-18/(x^2-9)=1
x(x-3)-18=(x^2-9)
x^2-3x-18=x^2-9
3x=-9
x=-3
x=-3时x^2-9=0
方程无解